Abstract A double suction centrifugal pump was chosen to the research objective to analyze the unsteady pressure fluctuations. Based on the finite element method, the forced vibration response calculations were completed based on the modal of the pump case for the different fluid pressures on the internal face, when the double suction pump running as a turbine and running as a pump. It was found that the interaction between the impeller and the tongue caused the unsteady characteristics near the tongue. In addition, the pressure fluctuation was mainly affected by the low frequency wave，and the response velocity was concentrated in the frequency of rotation, blade passing frequency and harmonic frequency due to impeller rotation and pressure fluctuation characteristics. As the third frequency 880083 Hz and the frequency of 3 BPF 884.991 Hz was close, which caused the resonance phenomenon. It reveals the change rule of the response velocity of the vibration of the pump case and provides the reference for the further research of reduction of vibration and noise.
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